You can order the complete setup from Electron.
Electron ER50: https://www.electron-retracts.com/er-50classic/
with following options:
Main turnion retraction angle - 90
Nose turnion retraction angle - 90
Controller - (you pick one that you need)
Front wheel - 75 mm
Main wheels - 100 mm
Nose strut - 211 mm
Main struts - 185 mm